Sobha, T.D., et al. “Synthesis of Acylamino Acid Amides and Acylamino Acids by the Simultaneous Reduction and Hydrolysis of Imidazolines ”. Asian Journal of Chemistry, vol. 10, no. 4, Mar. 2010, pp. 1059-60, https://asianpubs.org/index.php/ajchem/article/view/23790.